patch 8.2.4523: when gvim is started maximized the 'window' option isn't set

Problem:    When gvim is started maximized the 'window' option isn't set
            properly. (Christian J. Robinson)
Solution:   Check if 'windows' was already set or not. (Ken Takata,
            closes #9904)
diff --git a/src/version.c b/src/version.c
index aa027a9..a2f9d29 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4523,
+/**/
     4522,
 /**/
     4521,